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| All Patents in class 29/DIG.55 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 157,700 | Dec. 15, 1874 | C. Sellers | Machines for Threading Bolts | ||
| 311,099 | Jan. 20, 1885 | E.P. Baville | Machine for Threading Screws Bolts and Nuts | ||
| 1,522,465 | Jan. 06, 1925 | G.C. Kimmel | Internal Grinding Machine | ||
| 1,700,114 | Jan. 22, 1929 | C.H. Thompson | Surface Polishing Machine | ||